I have plotted a graph on a dark background but due to the axis-color and tick-value color it is very difficult to read. How do I change to color of the axis, ticks and axis tick value to white?
You could use CSS
to style the graph, for example
path.domain { stroke: white; }
.tick text { stroke: yellow; }
.c3-legend-item text { stroke: grey; }
To make the axis white, the tick labels yellow, and the legend text grey.